At first
Play a online game make the game feel slowly, due to the thread?
And then, the arrow couldn't change input insert when type, and lots of input will be losed, it trouble some control
In most important, the music exange will schlow down game, and maybe halt game, I meet it when play with griswoldz.
And most important in most important:
The cheat
That cancel build list for get resouces.it make your resouces be fully. And does "metal"/ "both" work?

And that load screen, it should include the process of players.
Stdout

hm, this maybe due to some socket related stuffs.
Did you try without AI players ?
Can you test with MP3s converted to OGGs ? (I faced a problem on some systems with MP3s so I converted them into OGGs)